Battery monitor control system
AssigneeBTECH, Inc.
InventorsEdward M. Potempa, Allan J. Baum, Jr.
Life of this patent
Estimating the term…
Abstract
A battery monitor control system has a load plate, two or more lead wires connected to two or more busbars in a string of batteries, and a digital signal processor. The load plate has one or more primary switches connected to two or more terminals of the batteries in the string of batteries. The load plate also has a load resistor and a current sensor. The primary switches are turned on and off to produce a ripple current in the string of batteries. The digital signal processor determines the real portion of the complex impedance of at least one of the batteries by analyzing the voltage and current waveform of the ripple current. The primary switches may be turned on and off with a sine wave modulation.
Claims9
A battery monitor control system comprising:
- a) a load plate comprising:
- 1) one or more primary switches adapted to be connected to two or more terminals of a string of one or more battery units connected in series;
- 2) a load resistor RL in series with said one or more primary switches;
- and
- 3) a current sensor in series with said one or more primary switches;
- b) two or more lead wires adapted to be connected to two or more busbars electrically connecting said battery units in said string;
- c) a digital signal processor adapted to:
- 1) control said one or more primary switches to produce a ripple current through said string of battery units, said ripple current having a ripple current wave form comprising a reference frequency;
- 2) measure a ripple voltage wave form across each of said battery units via said lead wires;
- 3) measure said ripple current wave form from said current sensor;
- 4) determine a real portion of a complex impedance of each of said battery units using said measured ripple voltage wave forms and said measured ripple current wave forms;
- and
- 5) output said real portion of said complex impedance of each of said battery units such that changes in said real portion of said complex impedance of each battery unit can be tracked over time
- d) said primary switches are controlled by a pulse width modulated sine wave
- e) said primary switches are turned on and off at a modulation frequency that is in the range of 4 to 16 times said reference frequency;
- and
- f) the pulse width between when said primary switches are turned on and off is modulated by a sine wave.
Dependencies are inferred from the claim text.